Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis Analysis on sap flow characteristics of Eucalyptus urophylla × E. grandis Carbon storage and its distribution in Eucalyptus urophylla × E. grandis plantations under three different soil preparation measures Water consumption characteristics and water use efficiency of Eucalyptus urophylla × Eucalyptus grandis and bamboo-willow seedlings Biomass and its allocation characteristics of Eucalyptus urophylla × E. grandis plantations at different stand ages